[phase-31 4/4] PostgreSQL metastore — migration + compaction columns#6245

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gtt/phase-31-pg-metastore

Commits on Apr 1, 2026

feat(31): PostgreSQL migration 27 + compaction columns in stage/list/publish

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fix(31): close port gaps — split_writer metadata, compaction scope, publish validation

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fix(31): final gap fixes — file-backed scope filter, META-07 test, dead code removal

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fix(31): correct postgres types for window_duration_secs and zonemap_regexes

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style: rustfmt

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test(31): add metrics split test suite to shared metastore_test_suite! macro

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fix(31): read compaction columns in list_metrics_splits, fix cleanup_index FK
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fix(31): correct error types for non-existent metrics splits

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style: rustfmt metastore tests and postgres
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